Grass Valley 8939FCA - Manual (Page 24)

24 8939FCA/FCB — Instruction Manual
8939FCA and 8939FCB Applications
Bi-directional Application
This section illustrates how the 8939FCA and/or 8939FCB can be used in a
bi-directional application. Four channels (1-4) can mux/demux four
signals in one direction while the other four channels (5-8) on the same
modules can mux/demux four signals in the opposite direction. When the
8939FCB COM port is connected to the 8939FCA via the EXP port, the
module can mux and demux up to 16 channels in two directions in any
combination.
A block diagram of the 8939FCA in a simple bi-directional application is
shown in
Figure 10 . For more channels (9-16), connect the 8939FCA EXP to
the 8939FCB COM port.
Figure 10. Bi-directional Simple Block Diagram
To utilize this application example, the following Grass Valley modules are
needed in two locations:
• One 8943CF 4 Channel Electrical to Fiber Converter modules and one
8943FC Fiber to Electrical module
• Two 8939FCA modules
8939FCA 8939FCA
Ch7 RX
Ch8 RX
Ch3 TX
Single-mode
8558_11
r0 Ch4 TX
Ch1 TX
To 8939FCB COM ports
for additional channels
Ch5 RX
Ch6 RX
Ch1 RX
Ch2 RX
Ch2 TX
Ch3 RX
Ch4 RX
Ch5 TX
Ch6 TX
Ch7 TX
Ch8 TX
EXP
8943CF CH 1-4
8943CF CH 5-8
8943FC CH1-4
8943FC CH 5-8
EXP
COM COM